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Cobalt sulfur compound/sulfur-doped carbon composite material preparation method

A technology of cobalt sulfur compound and carbon composite materials, which is applied in the direction of active material electrodes, electrochemical generators, electrical components, etc., can solve the problems of volume expansion of lithium-ion battery negative electrode materials, and achieve easy industrial production, alleviate volume expansion, The effect of good electrochemical performance

Active Publication Date: 2019-11-01
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of volume expansion in lithium-ion battery negative electrode materials, and provide a simple and low-cost cobalt-sulfur compound / sulfur-doped carbon composite material preparation method

Method used

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  • Cobalt sulfur compound/sulfur-doped carbon composite material preparation method

Examples

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Effect test

Embodiment 1

[0023] The preparation method of cobalt-sulfur compound / sulfur-doped carbon composite material is specifically completed according to the following steps:

[0024] 1. Dissolve 10mg of cobalt acetate in 3mL of N,N-dimethylformamide and acetonitrile with a volume ratio of 1:2 and place it at the bottom of the test tube. Slowly add 2ml of N,N-dimethylformamide to acetonitrile in a volume ratio of After the 1:1 buffer layer, add 10mg terephthalic acid dissolved in 3mL N,N-dimethylformamide and acetonitrile (volume ratio 2:1) mixture, let stand for 24h, wash, centrifuge and vacuum dry to obtain CoBDC samples (see NatMater, 2015, 14, 48-55);

[0025] 2. Preparation of precursor: 200mg CoBDC and 1000mg S powder were mixed uniformly in an agate mortar.

[0026] 3. High temperature pyrolysis: Under the protection of nitrogen, the precursor obtained in step 2 is placed in a tube furnace, heated to 650°C at a heating rate of 5°C / min, roasted for 5 hours, and naturally cooled to room temperatur...

Embodiment 2

[0036] A new type of material for lithium-ion battery anode materials—a preparation method of cobalt-sulfur compound / sulfur-doped carbon composite material, which is obtained by high-temperature calcination of metal organic framework complex and sulfur powder. This example is different from Example 1 Yes: the CoBDC of step two is 40mg, and the mass of S powder is 80mg. The other steps and parameters are the same as the specific embodiment 1.

[0037] Image 6 It is the cycle performance graph of cobalt-sulfur compound / sulfur-doped carbon composite material. Indicates that the sample is at 0.2A g -1 The capacity drops to 629.9mAh g after 120 cycles of current density -1 .

Embodiment 3

[0039] A new type of material for lithium-ion battery anode materials—a preparation method of cobalt-sulfur compound / sulfur-doped carbon composite material, which is obtained by high-temperature calcination of metal organic framework complex and sulfur powder. This example is different from Example 1 Yes: the calcination temperature of step three is 550°C. Other steps and parameters are the same as those in specific example 1. Electrochemistry shows that the sample is in 1Ag -1 It can still maintain 473mAh g after 500 cycles at current density -1 Capacity.

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Abstract

The invention relates to a preparation method for synthesizing a cobalt sulfur compound / sulfur-doped carbon composite material based on a metal organic framework material. The metal organic frameworkmaterial (CoBDC) and different proportions of sulfur powder are uniformly mixed as a precursor, and the precursor is subjected to pyrolysis under an inert atmosphere to prepare the cobalt sulfur compound / sulfur-doped carbon composite material. The method has the advantages that the preparation process is simple, the synthesis cycle is short, the repeatability is good, the yield is high, industrialproduction is easy to realize and the like, and besides, the material has good electrochemical performance as a lithium ion battery negative electrode material, thereby having an extremely broad application prospect in the lithium ion battery field.

Description

Technical field [0001] The invention relates to a research on synthesizing a cobalt-sulfur compound / sulfur-doped carbon composite material using a metal organic framework as a precursor and as a negative electrode material of a sodium ion battery, and belongs to the technical field of new energy. Background technique [0002] In today's society, fossil fuels are still the main source of meeting human energy needs. With the consumption of these energy sources, a large amount of nitrogen oxides, carbon dioxide, and sulfur dioxide will be produced, which will inevitably bring a lot of environments such as haze and global warming. problem. To this end, scientists continue to work hard to develop new technologies. In the past few decades, energy storage and conversion equipment led by lithium-ion batteries has been widely used in various portable electronic equipment and energy vehicles. In order to further meet people's demand for green energy, it is particularly important to develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525H01M10/054H01M4/02
CPCH01M4/362H01M4/5815H01M4/583H01M10/0525H01M10/054H01M2004/027Y02E60/10
Inventor 卜显和李昂常泽双微
Owner NANKAI UNIV
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